
    <button nz-button nzTitle="Title" nzContent="Content" nzPlacement="topLeft" nz-popover>Align edge / 边缘对齐</button>
    <button nz-button nzTitle="Title" nzContent="Content" nzPlacement="topCenter" nz-popover>Arrow points to center / 箭头指向中心</button>
  